EKO INSTRUMENTS CO., LTD. - Pyranometer MS-80 - Instruction Manual Ver. 3
In order to obtain high quality measurements from pyranometers, several criteria with respect to set-up and
mounting of the instruments have to be considered. Also see the Quick Start Guide for comprehensive setup
instruction details (included in the package of MS-80, MS-80A and MS-80M).
The ideal mounting position for pyranometers is a location which has a full hemispheric field-of-view without
any obstructions (such as buildings, trees, and mountain); however, it might be difficult to find such locations.
Therefore in practice, it is ideal to install in a position which is free from obstructions at 5° above horizon.
The setup location should be easily accessible for periodic maintenance (glass dome cleaning, desiccant
replacement, etc.), and avoid surrounding towers, poles, walls or billboards with bright colors that can reflect
solar radiation onto the pyranometer.
A strong physical impact to the pyranometer can lead to product damage and/or may cause changes to the
sensitivity.
1. Installing at Horizontal or Tilted Positions
1) Check the installation base where the pyranometer has to be mounted and make sure it has two fixing
holes with the appropriate pitch. The pitch sizes of the fixing holes are as follows (in mm):
Table 5-3. Fixing Hole Pitch and Bolt Size for Pyranometers
2) Setup the pyranometer with the signal cable connector facing the nearest Earth’s pole.
In the Northern hemisphere, the connector should be orientated North, in the Southern hemisphere, the
connector should be orientated South. If the signal cable connector is facing towards the sun, the
temperature of the connector increases and may cause measurement error due unwanted
thermoelectric power invited by the connector temperature increase.
3) Remove a sunscreen (except for MS-80U)
The sunscreen can be removed by loosening the knurling screw and sliding it towards the bubble level
direction.
*When carrying the MS-80 with sunscreen attached, always hold the instrument from the bottom.
Holding only the sunscreen part may lead to dropping the sensor as it comes off from the sunscreen.
4) Adjust the pyranometer in a horizontal position by using the 2 levelling screws observing the air bubble
in the bubble level while manipulating the levelling screws. The instrument is levelled horizontally if the
air bubble is in the centre ring.
If the pyranometer is not levelled properly, the pyranometer readings are affected by cosine and azimuth
errors. Periodically check the bubble level and adjust the pyranometer’s position if necessary.
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